气相法聚乙烯冷凝模式操作的模拟研究(Ⅱ) 聚合粒子过热的分析  

SIMULATION OF GAS-PHASE POLYETHYLENE WITH CONDENSED MODE OPERATION(Ⅱ) ANALYSIS OF OVERHEAT OF POLYMER PARTICLES

作　　者：杨荆泉[1] 陈伟[1] 阳永荣[1] 戎顺熙[1] 

机构地区：[1]浙江大学化学工程与生物工程学系,浙江杭州310027

出　　处：《化工学报》2001年第10期885-890,共6页CIESC Journal

摘　　要：通过建立气相法聚乙烯冷凝模式操作流化床乳化相中粒子外边界层的热质传递模型 ,研究了冷凝模式操作时聚合粒子的过热情况 .模拟结果显示在通常条件下 ,聚合物粒子在生长初期的表面温度存在多重稳态解 ;冷凝操作有助于降低大的聚合物粒子的边界层温度梯度 ,但对粒子生长初期的边界层温升几乎没有影响 ;慢启动、高活性。A heat and mass transfer model across the external boundary layer of polymer particles in emulsion phase with condensed mode operation was derived.The overheat possibility of particles was analyzed by using the model.Simulation results indicate that in the early lifetime,there exist multi-steady states of surface temperature of growing particles.Using the condensed mode operation will be helpful to reduce the temperature gradient for larger particles,but not for very small particles.The type of catalysts with a low startup,high activity and quick deactivation was suggested to be used in the condensed mode operations.

关 键 词：聚乙烯 热传递 过热 冷凝模式 模拟 聚合粒子 热质传递模型 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业] TQ021.3